I always have to search how to generate a random integer number between a range because this is a common task that I use a lot in tests, but really, I can't memorize it.

Though, this is how I would do it in 2021.

use v5.16;
use strict;
use warnings;

# Class definition
package Random::Range {
  use Zydeco;
  class Integer {
    method pick ( Int $min, Int $max ) {
      return $min + int ( rand ( $max - $min ));
    }
  }
}

# Script
say Random::Range->new_integer->pick(1, 100);
#==> 42 

So what did we do here? We used the rand function where we applied the int function, so we would get an integer, not a fractional number. The small calculation makes possible to restrict the result to the desired interval.

All of this is glued into a minimal Zydeco class that adds a very nice object-oriented interface. You maybe don't need Zydeco, this simple one-liner would work:

perl -le 'my @interval = (1, 100); print $interval[0] + int ( rand ( $interval[1] - $interval[0] ))'  

Note this is not cryptographically secure and should only be used in simple cases: if you need a secure implementation, please check some appropriate solutions on CPAN.

Art: digital painting by myself.